Fire-alarm.



R.-E. SHERBR.

FIRE ALARM.

APPLICATION FILED APE. 11, 1911.

1,05 ,951 Patented Mar. 25, 1913.

" 41 1 2 I Em t m1 Attorneys A further object of th eration ofth e device,

" BOY a stream, or LUCK, wIscoNsm,

rmn nranm.

, Specification of Letters iatent. Patented 113 25 1913 lApplieatiormedApril14,1911. Serial No. carom,

To all it concern v Beitjknownthat I, Ror- Luck, in'th'e countyof 'Polk'and State of .Wisconsin, have invented a new and useful Fire-Alarm, of which the following is .a specifica'tiomf It is one objectof thefpresentinventioii' tov provide a'simp'le fo'rm of 'signahso constructed that when-a 'fuse,' meltingiat low temperature,- is severed, a signal will be, operated,' electrically,- thereby indicating. that a r-ise'intemperature, su cient to. melt the fuse, has taken place a I e invention is to provide no-rel means for maintaining the sev-' eral constituent eleinents of the structure in propenrelation'to each other, during the-opand, when the structure is inactive.

A further object ofthe inyention is to provide a fuse which shallbe so constructed that an unusually low degree ofheat, will be suflicient to melt the same.

With the'foregoing-and other objects-in View which will appear as the' descripti0n proceeds, the invention resides in the combination and arrangement of parts and in the details of construction hereinafter described and claiined,it being understood'that changes in the precise embodiment .ofinvention herein disclosedcan be made wlthln the.

scope of what is claimed without departing 4 from the spirit of the invention.

In the drawings,-Figure 1 is a sectional elevation, showing the parts of the structure,

' in the positions which they will assume when normal conditions exist; Fig. '2 is a similarviewshowing the" parts in the positions which they will assume when a fire is in progress;

In carrying out the inventlon there 1s provideda supporting case 1, carrying a bracket 2, upon which is supported an electro-magnet 3, adapted to attract an armature 4, carr ed upon one end of'a spring arm 5,-the-spr1ng' arm 5 being-secured to a bracket 6 which, in its turn, is carried byv the support 1.

Extended inwardly from the case 1, is a contactpost '7, adapted to'be engaged by the armature 4, when the same is released from the magnet 3. The contact post 7 carries,

upon the outside of the case 1, a'binding screw 8. I

One of the' winding terminals of: the magnet 3, islconnected with a binding post s mm a citizen of the United States, residing at with 34 binding case 1 .Froin th e'bindingpost .12, a conductor 14 10, mounted in the as 1.- The other winding termlnal 11 of the magnet 3 connected I .post 12,. also; carried by the 1 leads-to a battery 15 or other source of elec trical supply, andfromthe battery 15 there lea s a conductor 16to one-end of a fuse 17, mal tained by means of clampsc'rews 19, in arms '20, depending from a bracket 21, the

bracket being fashioned from insulating maanal. The intermediate portion of the fuse 17 is-surrounded bye-wrapping '22, of such material that it will ignite at a point well below the melting. pointof the fuse, the construct'ion, obviously, being such that when the wrapping 22 is ignited,.-the melting of the: fuse 17 will be accelerated.'-' From the fuse 17 there'leads another conductor 23.

The conductor 23 is bound upon the fuse 17,- and a conductor16 is "bound thereon, and both conductors and the fuse 17 are held in i the arms 20, by the clamp screws 19. The

' conductor 23 is connected with a switch 24,

and from the switch 24' there leads a conductor 25 to the binding post 10. a

From the binding post 8, there leads a conductor-'26, and in this conductor 26 is an electrically operated signal, preferably a bell 2.7; One side of the bell 27 is connected thebinding'post 32with the bracket 6.

Presupposing that theparts are in the positions shown in Fig. 1, the device-includes the following closed circuit: one

winding terminal 1l,of the. magnet, the binding'member-12, the conductor 14, the

' battery 15, the conductor 16, the fuse 17, the

conductor 23, the switch 24. theconductor- 25, the bindingpo'st 10, and the other terniinal 9 of the Winding of the electromagnet.

This closed circuit will energize the magnet 3, attracting the armature 4 away from the contact. member 7..' The signal circuit is therefore broken between-the elements 4 and 7, as shown in Fig. 1. This signal circuit embraces the following elements the contact 7, the binding post 8, the conductor 26,

the bell 27, the conductor 28, the battery 29,

the conductor 30, the binding post 32, the

conductor 33, the bracket6, the spring arm 5, and the armature 4. 4 As soon asthe fuse 17 melts, and parts, as

shown in Fig. 2, it is obvious that the fuse circuit will be opened, thereby demagnetizing the member 3, and permitting the spring arm 5, to swing the armature 4 against the contact '7, whereupon the signal circuit will be closed, at the members 1 and 7, the bell 27 soundihg, and indicating thepresence of dangerous temperature conditions :which have caused a severing of the fuse 17. It is tobe noted that. the fuse 17 is surrounde l by the inflammable cover 22, and that this covering will ignite, at a relatively low point. As soon as this wrapping 22 commences to burn, the fuse 17 will be heated, far above the point of ignition of the wrapping 22, so that a relatively low temperature point Will be sufficient to'break the fuse circuit, and to close the signal circuit.

If desired, the signal circuit may include aswitch 50.

The cover or wrapping 22 may be fashioned from a' wide variety of materials. It may consist of textile fiber or tinder commingled with a stable phosphorous compound: the kindling temperature of the wrapping, in any event, being lower than the fusing point of any alloy having the necessary electrical conductivity. The burning of the cover or wrapping hastens the severing of thefuse and also permits the use of a fuse which is a better conductorthan one in which the melting point alone is -considered.

Having thus described the invention What is claimed is A device of the class described comprising a fusible conducting member; and

ducting member, the conducting member being fusible under the heatgenerated by the burning of the inflannnable element.

'2. A device of the class described comprising a fusible conducting member; and

an inflammable covering surrounding the conducting member, the covering being adapted .to bevignited at a lower degree of heat than that atvvh'lch the conductmgmember melts, thereby to'hasten the melting of the conducting member, the conducting member being fusible under the heat generated by the burning of the covering.

3. A. device of the class described comprising a conducting member fusible under a low degree of heat; and an inflammable, tubular element surrounding the conducting memberand completely housing the con- "ducting member, intermediate the ends of the conducting member, the tubular element igniting at a lO\V1 degree of heat than that at- -\\'l1l(l1 the conducting member melts, thereby to hasteli the n'lelting of the conducting member.

In testimony that I claim the foregoing as my own, I have hereto afiixed my signature inthe presence of two witnesses.

ROY I. SHERER.

itneses:

C. G. Sinciusn, C. A. Love. 

